The British boyband are predicted to earn the huge sum, equivalent to £611million, thanks to their latest world tour.

The 88-date tour will see the band become the first act ever to play three nights at the 95,000-seater Pasadena Rose Bowl in California.

Yesterday a spokesman for the boys, Louis Tomlinson, 22, Zayn Malik, 21, Liam Payne, 20, Niall Horan, 20, and Harry Styles, 20, said: “It would be amazing for 1D to climb to the very top of the tour league so early in their career.

“That would be a phenomenal testament to the loyalty and support of their fans.”

The latest gigs will see 1D beat the previous £447m record set by U2 for their 360° tour.

It will also eclipse the £339m earned by rock veterans The Rolling Stones during their Bigger Bang shows.

“It would be amazing for 1D to climb to the very top of the tour league so early in their career”

A One Direction spokesperson

Music industry expert Mory Brenner said: “You have to go back to 1964, when The Beatles led the British Invasion that turned American’s music industry upside down, to find anything close to the following they have.”

But others warned the boys that they are risking pushing themselves too hard.

Hollywood media analyst Mike Raia said: “They may be young and full of energy but they will still have to pace themselves and occasionally step off the rollercoaster for a break. Otherwise they will burn out.”

Meanwhile, Harry celebrated his 20th birthday with a lavish bash at a Californian mansion.